Wearable CSRR-based Sensor for Monitoring Glycemic Levels for Diabetics
Ala Eldin Omer, George Shaker, Safieddin Safavi‐Naeini
Abstract
Monitoring glycemia levels in people with diabetes has developed rapidly over the last decade. A broad range of easy-to-use systems of reliable accuracies are now deployed in the market following the introduction of the invasive self-monitoring blood glucose meters (i.e. glucometers) that utilize the capillary blood samples from the fingertips of diabetic patients. However, the limitations and discomforts associated with these painful finger pricking devices have established a new demand for non-invasive pain-free blood glucose monitors to encourage more frequent glucose checks and thereby contribute more generously to diabetes care and prevention. In this study, a novel microwave biosensor is developed in a wearable format to enable non-invasive real-time monitoring of blood glucose level. The design comprises three cells of circular complementary split ring resonators (CSRRs) incorporated in the ground plane of an FR4 dielectric substrate. The passive sensing elements (CSRRs) are excited remotely via a coupled antenna to enable the wearable sensing in a reader/tag configuration. The CSSR-sensor is numerically modeled and analyzed for sensing the glucose concentrations relevant to diabetes condition (60-500mg/dL) by tracking the resonant amplitude variations in the frequency range 1-4GHz. The sensitivity performance of the TP-CSRR tag is practically demonstrated through in-lab measurements using a VNA setup.